any member of the order Tetraodontiformes, a group of primarily tropical marine fishes that evolved from the Perciformes (the typical advanced spiny-rayed fishes) during the Eocene Period of the Cenozoic Era, about 50,000,000 years ago. Included are the triggerfishes, puffers, and porcupine fishes.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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